Author Topic: Mac super 250  (Read 844 times)

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Offline thefox48

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Mac super 250
« on: December 16, 2013, 11:23:39 pm »
Hi all
Does anyone know if all of the Mcculloch super 250s were 87ccs?
I have heard that some of the earlier models were 80cc.
Thanks

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Offline Eccentric

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Re: Mac super 250
« Reply #1 on: December 17, 2013, 12:27:06 am »
Hi all
Does anyone know if all of the Mcculloch super 250s were 87ccs?
I have heard that some of the earlier models were 80cc.
Thanks

In several discussions...........there has been conflicting info.  Supposedly some of the 'yellow top' Canadian made Super 250's were 80cc.  Whether they had the same porting as the 87cc Super 250's...........I don't know.  I do know that an 87 S-250 has a LOT more beans than a 'regular' 250.  Much more than 7cc worth.  An 87cc S-250 has more 'snap' than an 87cc 300, despite being basically the same saw.  Must be down to port timing/shapes.  My 87cc Super 250 is one of my favorite saws.
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

Offline thefox48

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Re: Mac super 250
« Reply #2 on: December 17, 2013, 12:46:36 am »
Thanks much for the info
Larry

Offline Eccentric

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Re: Mac super 250
« Reply #3 on: December 17, 2013, 12:48:01 am »
Thanks much for the info
Larry

You're welcome Larry.  If you can get yourself a Super 250, strongly suggest you do it.  Here's mine.

-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

Online Al Smith

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Re: Mac super 250
« Reply #4 on: December 17, 2013, 02:39:38 pm »
IMO the 87 cc reeders were the best McCulloch ever built .People like to hype up the 797  and 125's but pound for pound the 87's were a leg up on them displacement taken into account .

You aren't going to wind one up to 14 thousand RPM but the they pull like Georgia mule .

Offline doreadeal

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Re: Mac super 250
« Reply #5 on: December 17, 2013, 02:46:23 pm »
I wonder why reed valve engines didn't stay long in the chainsaw industry, they just seemed to run better.

Online Al Smith

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Re: Mac super 250
« Reply #6 on: December 17, 2013, 06:25:02 pm »
They stuck around for a long while if you think about .The trend changed I'd imagine is why they went away.

Those old reeders like the 250 Mac and C5 Homelite got replaced by 10-10 Macs and xl-12 Homelites .The Homeys kept the reeds but they were light weight and for the type of cutting more conveniant  and cheaper .Then things progressed further into to lighter faster saws such as we have today .

I've got a couple 250's for example .They cut just fine for being made in the 60's but not something you'd care to run all day . A tank or two every so often but the rest of the time it's a lighter weight faster saw .

Offline thefox48

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Re: Mac super 250
« Reply #7 on: December 17, 2013, 07:25:56 pm »
I will have to agree with that. I have got a 1-72 and a 380 that are 87s and they scream. My standard 250
runs great also.
The 380 has a flat back that I rebuilt a while back but finally had to rebuild the primer and it starts on the second or third pull. A lot of people hate the flatbacks but most of the time it seems to be a problem getting them started when cold, again thats the primer issue from what i have seen. After that is solved seems to be quite good.

Online Al Smith

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Re: Mac super 250
« Reply #8 on: January 03, 2014, 07:13:18 am »
I've only got one of those flat backs to deal with .I think it's on a 250 but it might be a super .It was a freebie which I got running after having the carb apart a half dozen times .

I never thought much about but come to think about it might be a super because it would outcut the other couple of 250's I have .The investigation is going to have to wait because it's cold enough out now to freeze the tail off a brass monkey not to mention other portions of its' person .

Offline neil

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Re: Mac super 250
« Reply #9 on: January 03, 2014, 03:36:26 pm »
I've only got one of those flat backs to deal with .I think it's on a 250 but it might be a super .It was a freebie which I got running after having the carb apart a half dozen times .

I never thought much about but come to think about it might be a super because it would outcut the other couple of 250's I have .The investigation is going to have to wait because it's cold enough out now to freeze the tail off a brass monkey not to mention other portions of its' person .

Al, if i may move the subject slightly,,,,
I have built up a few later 6-10 macs (black square ones with a horrible looking chain brake (free) most not going with bits missing. Question is are they the same piston and cylinder ect to the older 6-10 from the 70's, if not i cannot see any point to excepting any more.
thanks Neil


 

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